Boiler Mountings & Accessories
Boiler Mountings & Accessories
Boiler mountings are used to run a
boiler in a safe way ex: safety valve, Water level indicators etc. Boiler
mountings are primarily intended for the safety of the boiler and for complete
control of steam generation process.
Boiler accessories are used to improve the efficiency of a
boiler ex: economizer, air preheater etc. Boiler accessories are installed to
increase the efficiency of the boiler plants to help in proper working of
boiler unit.
Boiler Mountings
·
Boiler mountings are
components used for ensuring the safety of boiler operation.
·
These are generally
mounted on the surface of the boiler.
·
Control fluid parameters
at the inside of the boiler shell.
·
The mountings are the
essential part of a boiler, without which boiler operation is impossible.
Examples: Pressure gauges, Water level indicator, Safety
valves, Stop valve, Fusible plug, Blow off cock, etc.
Boiler Accessories
·
Accessories are the
auxiliary items required for proper operation of boiler and improve the
efficiency of it.
·
These are integral parts
of the boiler, but not mounted on it.
·
Control fluid parameters
at outside of the boiler.
·
These are not essential
parts of the boiler, without which boiler can operate though at lower
efficiency.
Examples: Super heater, Feed pump, Injector, Economizer,
Steam separator, Air preheater, etc.
Difference between Boiler Mountings and Accessories
The different boiler mountings and
accessories that are installed on the steam boiler are as follows
Boiler mountings
- Water
level indicator ( Water level gauge)
- Pressure
gauge
- Safety
valves
- Stop
valve
- Blow
off cock (Blow off valve)
- Feed
check valve
Boiler accessories
- Air
pre-heater
- Super
heater
- Economizer
- Feed pump
The function of various boiler mountings and accessories
are:
1. Water Level Indicator
·
It is fitted in front of
the boiler and generally present two in number.
·
It is used to indicate the
water level inside the boiler. It shows the instantaneous level of water that
is present inside the steam boiler which is necessary for its proper working.
2. Pressure gauge
·
It is also present in
front of the boiler.
·
It is used to measure the
pressure of the steam inside the boiler.
The pressure gauges generally used are of Bourden type
3. Safety Valves
·
Safety valves are attached
to the steam boiler chest.
·
It is used to prevent
explosion due to excessive internal pressure. When the internal pressure inside
the boiler exceeds its working pressures than the safety valves blow off the
steam and maintains the internal pressure.
Generally two safety valves are present on a boiler.
4. Stop Valve (steam stop valve)
It is usually fitted on the highest part of the boiler
with the help of a flange.
The main function of the stop valve is
·
To control the flow of
steam from the boiler to the main steam pipe.
·
To completely shut off the
steam supply when required.
5. Blow Off Cock
·
It is fitted at the bottom
of the boiler drum.
·
The functions of blow off
cock is
·
To empty the boiler
whenever required.
·
To discharge the scale,
mud and sediments which gets collected at the bottom of the boiler.
6. Feed Check Valve
·
It is non-return valve and
fitted to a screwed spindle to regulate the lift.
·
It is fitted to the shell
slightly below the normal water level of the boiler. A boiler must have its
spindle lifted before the pump is started.
·
It regulates the supply of
water which is pumped into the boiler by feed pump.
7. Fusible Plug
·
It is fitted to the crown
plate of the furnace or firebox.
·
Its function is to
extinguish fire in the furnace when the water level in the boiler falls to an
unsafe limit. This avoids the explosion that may takes place because of the
overheating of the furnace plate.
Boiler accessories:
the boiler accessories are the integral parts of the
boiler. They are used in the boiler to improve its efficiency.
1. Air preheater
·
It is used to recover heat
from the exhaust gases.
·
It is installed between
the economiser and the chimney.
2. Super heater
·
It is placed in the path
of hot flue gases from the furnace.
·
A super heater is an
important accessory used in the boiler.
·
Its main function is to
increase the temperature of saturated steam without raising its pressure.
3. Economizer
·
It is used to heat the
feed water by the utilization of heat from the hot fuel gases before it leaves
the chimney.
·
A economizer improves the
economy of the steam boilers.
4. Feed pump
·
It is used to deliver
water to the boiler.
·
This is the brief
introduction of important boiler mountings and accessories. If you find
anything missing or incorrect than let me know about it through your comments.
No comments